Core structure for dynamo-electric machines.



E. R. KNIGHT.

GORE S TUBE FOR DYNAMO ELEGTRI OHINES.

PPLIOATION FILED JUNE '7, 1e

1,030,095. Patented June 18,1912.

\ 13 y so 25 21 I z 20 m 17 18 1 1s 1s 14 11 1o UNITED STATES PATENT OFFICE.

EARLE R. KNIGHT, 0F NORWOOD, OHIO, A$SIGNOR T0 ALLIS-CHALMERS COMPANY, A

. CORPORATION OF NEW JERSEY.

CORE STRUCTURE FOR, DYNAMO-ELECTRIC MACHINES.

Specification of Letters Patent.

Patented June 18, 1912.

To all whom it may concern:

Be it known that I, EARLE R. KNIGHT, a citizen of the United States, residing at Norwood, in the county of Hamilton and State of Ohio, have invented certain new and useful In'lprovements in Core Structures for Dynamo-Electric Machines, of which the following is a full, clear, and exact specification.

My present invention relates to the con struction of dynamo-electric machines and particularly to induction motors.

It is the object of my invention to simplify the construction of dynamo-electric machines and to provide novel means to reinforce the cores of such machines.

My invention consists in certain novel details of construction and arrangement of parts which will be described in the speci tication and set forth in the appended claims.

In the accompanying drawings Figure 1 is a partial sectional View of a squirrel-cage induction motor embodying my invention; and Fig. 2 is a fragmentary end view of a squirrel-cage induction motor with the end cover removed.

Referring to the figures of the drawing, 10 represents a shaft mounted in the bearings 11 which are integral with the end covers 12 of the motor housing 13. A core 14, preferably laminated and provided with slots, is pressed tightly on the shaft 10. This core is provided with a plurality of apertures 15 through which pass a plurality of reinforcing plates 16. These plates are stamped out of sheet metal and are provided with a plurality of end project-ions 17 which are at right angles to the main portion of the plate and engage the sides of the core to prevent movement and particularly axial movement of the laminae of said core. The reinforcing plates 17 belonging to one group are all slipped through one of the apertures 15 at the same time and are adjusted so that the main portion of the plates are in a plane parallel to the axis of the shaft and the projecting portions extend radially outward. During this operation the core is clamped by any desired means pressing the laminae as closely together as possible. lVhen the substantially U-shaped reinforcing plates are properly adjusted and the small projections 18 which are at right angles to the projecting end portions 17 and parallel to the main portion of the reinforcing plate engage slots 19 in end disks 20, the clamping member is removed from the core allowing the core to expand to firmly fasten the reinforcing plates in a fixed position. Due to the small integral projections 18 occupying the slots 19 in the end disks 20, and one surface 16 of the reinforcing plate engaging the outer surface bounding the aperture 15 in the core 1%, it is impossible for the reinforcing plate to shift its position. In this way the reinforcing plate is held fast and the end disks and laminae of the core are prevented from moving. The projections 17 further support and center short-circuiting rings 21 to which are connected conductors 22 which occupy slots in the core 14.. These conductors pass through holes in the short-circuiting ring and are secured firmly thereto by means of being wiped or bent over by a cup-shaped tool for this particular purpose. The projections 17 not only act to reinforce the core 14, support and center the short circuiting ring 21, but also act as fan blades.

The stator core 23 as well as the rotor core is built up on a mandrel and is sup ported by adjacent end disks 2% and clamped tightly together. Another set of reinforcing plates 25 is then properly adjusted around a portion of the core and the clamping member removed, the core expanding and being reinforced by said plates 25. These plates are also provided with end projections 26 which also have small pro jections 27 which occupy slots 28 in the end disks. The core, end disks, and reinforcing plates, the latter of which are circuinferentially spaced around said core, are all taken as a unit and pressed into the yoke 29. The yoke is provided with a plurality of circumferentially spaced projections 30 which are engaged by said core and tightly hold the latter. After the stator core is properly pressed into the machine it is pro vided with a winding comprising conductors 81.

This means of reinforcing cores is not limited to induction motors, but is applicable for use in all dynamo-electric machines of small capacity in which laminated cores are used. lVith this construction all dovetail ing is done away with and it is not necessary to use bolts passing through the cores for supporting them.

It is evident there may be many modifications of the precise arrangement here shown, and I aim in my claims to cover all such modifications which do not involve a departure from the spirit and scope of my invention.

hat I claim as new is 1. In a dynamo-electric machine, the combination of a laminated core including disks having notches and being adjacent to said core, and plates passing through said core and provided with end projections cooperating with the notches in said end disks to prevent movement of said disk and the laminae of said core.

2. In a dynamo-electric machine, the combination of a laminated core, a support therefor, conductors carried by said core, short-circuiting rings to which said conductors are secured, and removable reinforc ing plates independent of said support and provided with end projections and passing around a portion of said core, said short-circuiting rings being supported and centered by said end projections of said reinforcing plates.

3. In a dynamo-electric machine, the coinbination of a laminated core including disks having notches and being adjacent said core, reinforcing plates provided with end projections and passing around a portion of said core, said end projections engaging said notches in said disks to mutually clamp said laminae and plates, conductors carried by said core, and short-circuiting rings sup ported and centered by said end projections and to which said conductors are connected.

at. In a dynamo-electric machine, the combination of a slotted and laminated core provided with a plurality of apertures, a support therefor, removable reinforcing plates independent of said support and provided with end projections and passing through said apertures, said end projections engaging the ends of said core, short-circuiting rings supported and centered by said end projections, and conductors occupying the slots in said core and secured to said shortcircuiting rings.

5. In a dynamo-electric machine, the combination of a core, a yoke provided with a plurality of projections for supporting and centering said core, and reinforcing plates arranged alternately with respect to said supporting projections and provided with end projections and passing around said core to prevent movement of the laminae of said core.

6. In a dynamo-electric machine, the combination of a laminated core, a yoke provided with a plurality of projections circumferentially spaced for supporting and centering said core, and a reinforcing plate between two of said supporting projections and provided with end projections to prevent axial movement of the laminae of said core.

7. In a dynamo-electric machine, the combination with a laminated core provided with an aperture, and plates located in said aperture,'said core and plates having interlocking parts for mutually holding each other in a clamped position.

8. In a dynamo-electric machine, the combination of a laminated core having apertures, and plates passing through said apertures and having end projections engaging the sides of said core, said core and projections of said plates having interlocking portions for mutually holding each other in a clamped position.

9. In a dynamo-electric machine, the combination of a laminated core provided with an aperture, a support for said core, and a plurality of reinforcing plates independent of said support and provided with projections abutting said core to prevent movement of the laminae of said core, said reinforcing plates passing through said aperture.

10. In a dynamo-electric machine, the combination of a laminated core having an aperture, a support for said core, and a U- shaped reinforcing plate independent of said support and having portions adapted to prevent movement of the laminae of said core, said reinforcing plate passing through said aperture.

11. In a dynamo-electric machine, the combination of a laminated core, a support for said core, and a U-shaped reinforcing plate independent of said support and having portions adapted to prevent movement of the laminae of said core.

Milwaukee, Vi is, May 21, 1909.

In testimony whereof I aflix my signature, in the presence of two witnesses.

EARLE R. KNIGHT.

\Vitnesses HARRY F. THOMPSON, G120. M. SOHULTE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

